Writing instrument



FIG. 1 is a perspective view of the writing instrument embodying my invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right-side elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top-plan view thereof; and,

FIG. 7 is a bottom-plan view thereof. 

The ornamental design for a writing instrument, as shown and described above. 